12
3
None
The best mathematician is all determined on opinion. There are many good and smart ones, but the "best" appeals to opinion.
That depends on which hole. Shorter holes will have more common hole in ones than long ones. In general, still very rare.
12
Half a hole is still a hole, so the answer is five!
8
The idea is to divide 10 by (1/2). Half is the same as 0.5. if you divide 10 by 0.5 on a calculator, you get 20
2
3
7 of them.
4
halves
There are two halves in a whole. If you multiply 2 by 10 you get the answer 20.
There are 5 halves in 10 whole ones.
At least 628.